Abstract
An efficient and facile protocol for the one-pot synthesis of 2H-indazolo[2,1-b]phthalazine-triones in the presence of a Brønsted acidic deep eutectic solvent has been developed. The Brønsted acidic deep eutectic solvent was readily prepared via heating the mixture of choline chloride and p-toluenesulfonic acid. In addition, the deep eutectic solvent is non-toxic, cost-effective and recyclable.
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